Uplink Power Control Timing for NR UCI and BWP Switching
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Solution Overview
Problem
In New Radio (NR) communication systems, the large bandwidth of serving cells exceeds the capabilities of user equipment (UE), leading to challenges in uplink power control and efficient transmission of uplink control information (UCI) due to limited frequency-domain processing capabilities, and the need for effective Bandwidth Part (BWP) switching and CSI reporting without clear timing mechanisms.
Innovation Solution
A method and device for uplink power control that determine the timing between power control commands and Physical Uplink Control Channel (PUCCH) transmissions, allowing for effective power adjustment, and a method for UCI transmission using cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) or single carrier-frequency division multiplexing (SC-FDM) waveforms, along with dynamic BWP switching and CSI reporting based on selected BWPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses CP-OFDM waveform for PUSCH transmission, then the frequency diversity gain is improved, but the peak-to-average power ratio (PAPR) increases causing spectral spread interference
Solution Approach 1:
The patent applies different waveform types (CP-OFDM or SC-FDM) to different parts of the frequency domain based on local characteristics. Specifically, the UE determines waveform selection based on the frequency location and channel conditions, using CP-OFDM in frequency-diverse regions for improved diversity gain while using SC-FDM in regions where low PAPR is critical to avoid spectral spread interference.
Solution Approach 2:
The patent implements dynamic waveform selection where the UE can switch between CP-OFDM and SC-FDM waveforms based on real-time channel conditions, interference levels, and frequency diversity requirements. This dynamic adaptation allows the system to optimize between frequency diversity gain and spectral spread interference avoidance depending on the current transmission environment.
2Productivity
If the UE transmits UCI and data on the same channel, then the transmission efficiency is improved, but the power control accuracy deteriorates due to different power requirements
Solution Approach 1:
The patent segments the uplink transmission into separate channels for UCI (Physical Uplink Control Channel) and data (Physical Uplink Shared Channel). This segmentation allows independent power control for each channel type, ensuring that UCI receives appropriate power for reliable control signal transmission while data channels receive power optimized for their specific requirements, thereby maintaining power control accuracy while still achieving high transmission efficiency through multiplexing.
Solution Approach 2:
The patent introduces power control commands as an intermediary mechanism that mediates between the conflicting power requirements of UCI and data transmissions. The base station sends power control commands to the UE that adjust the transmission power of UCI relative to data, allowing the system to maintain both transmission efficiency and power control accuracy by dynamically balancing the power allocation based on channel conditions and transmission priorities.
3Productivity
If the UE supports the whole bandwidth of the serving cell, then the spectral efficiency is improved, but the UE capability requirements increase excessively
Solution Approach 1:
The patent segments the total bandwidth into multiple Bandwidth Parts (BWPs), where each BWP is a subset of the total cell bandwidth that the UE can process independently. This segmentation allows the UE to operate with manageable bandwidth portions while the system achieves high spectral efficiency through proper BWP configuration and switching. The UE capability is aligned with the segmented BWP size rather than requiring full-cell bandwidth processing.
Solution Approach 2:
The patent implements dynamic BWP switching where the UE can be configured with different active bandwidth parts based on transmission requirements, channel conditions, and UE capability. This dynamic adaptation allows the system to optimize spectral efficiency by activating appropriate BWPs while keeping UE complexity manageable by only processing the currently active BWP rather than the entire cell bandwidth simultaneously.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a method for uplink power control, which is applied to a User Equipment (UE), and the method includes: determining a timing between a power control command and a Physical Uplink Control Channel (PUCCH), which adopts the power control command to control power. The present disclosure also provides a corresponding device.